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Winter Storm WINTER STORM HAZARD DESCRIPTION ..................................................................................................... 1 LOCATION .............................................................................................................................. 1 EXTENT................................................................................................................................... 1 HISTORICAL OCCURRENCES .......................................................................................... 3 SIGNIFICANT PAST EVENTS .................................................................................................... 4 PROBABILITY OF FUTURE EVENTS .............................................................................. 5 VULNERABILITY AND IMPACT ....................................................................................... 5 Hazard Description A severe winter storm event is identified as a storm with snow, ice, or freezing rain—all of which can cause significant problems for area residents. Winter storms are associated with freezing or frozen precipitation such as freezing rain, sleet, snow and the combined effects of winter precipitation and strong winds. Wind chill is a function of temperature and wind. Low wind chill is a product of high winds and freezing temperatures. January is the month when snow, sleet or freezing rain is most likely to be observed; yet, winter weather conditions can occur at any time during the winter and early spring months. Location Winter storms vary in location, intensity and duration but are considered rare occurrences in CVCOG communities. It is assumed that all of the jurisdictions are uniformly exposed to winter storm events; therefore, all areas of the counties are equally exposed. Extent Table 11-1 below displays the magnitude of severe winter storms. The wind-chill factor is further described in Figure 11-1. This is an index developed by the National Weather Service, although the chart is not applicable when temperatures are over 50° or winds are calm. C O N C H O V A L L E Y H A Z A R D M I T I G A T I O N P L A N U PDATE Winter Storm Table 11-1. Extent Scale - Winter Weather Alerts WINTER This alert may be issued for a variety of severe conditions. Weather WEATHER advisories may be announced for snow, blowing or drifting snow, ADVISORY freezing drizzle, freezing rain, or a combination of weather events. WINTER STORM Severe winter weather conditions may affect your area (freezing rain, WATCH sleet or heavy snow may occur separately or in combination). WINTER STORM Severe winter weather conditions are imminent. WARNING FREEZING RAIN Rain or drizzle is likely to freeze upon impact, resulting in a coating of OR FREEZING ice glaze on roads and all other exposed objects. DRIZZLE Small particles of ice usually mixed with rain. If enough sleet SLEET accumulates on the ground, it makes travel hazardous. Sustained wind speeds of at least 35 mph are accompanied by BLIZZARD considerable falling or blowing snow. This alert is the most perilous WARNING winter storm with visibility dangerously restricted. FROST/FREEZE Below freezing temperatures are expected and may cause significant WARNING damage to plants, crops and fruit trees. A strong wind combined with a temperature slightly below freezing can have the same chilling effect as a temperature nearly 50 degrees WIND CHILL lower in a calm atmosphere. The combined cooling power of the wind and temperature on exposed flesh is called the wind-chill factor. Wind chill temperature is a measure of how cold the wind makes real air temperature feel to the human body, similar to the heat index for extreme heat (Figure 12-1). Since wind can dramatically accelerate heat loss from the body, a blustery 30°F day would feel just as cold as a calm day with 0°F temperatures. The CVCOG Region has been subject to winter storm watches, warnings, freezing rain, sleet, snow and wind chill. CVCOG | Hazard Mitigation Plan Update | Page 2 Winter Storm Figure 11-1. Wind Chill Chart The Concho Valley Region is part of the Panhandle Plains in Texas for the northern half of the region and the Hill Country for the southern counties. As a whole this region experiences similar winter events. Winter nights for the area commonly see temperatures fall below the freezing mark, or 32 °F. From the past occurrence data, all counties have experienced ice storms, heavy snow, winter storms and winter weather. The average number of cold days are similar for each county. Therefore the intensity of a winter storm event to be mitigated for the area is an ice storm and heavy snow. Historical Occurrences Table 11-2 shows historical occurrences for the area since 1950, as well as the type of event provided by the National Climatic Data Center (NCDC). Although there have been relatively few storms, it is likely that a high number of occurrences have gone unreported. Additionally, historical winter storm information, as provided by the NCDC, shows winter storm activity across a multi-county forecast area for each event. In some instances within the study area, a single record could consist of up to 27 counties including some or all of the ones participating in this risk assessment. Therefore, an appropriate percentage of the total property and crop damage reported for the entire forecast area has been allocated to each participating county impacted by each event. CVCOG | Hazard Mitigation Plan Update | Page 3 Winter Storm Table 11-2. Historical Winter Storm Events by Jurisdiction, 1950-2010) NUMBER OF COUNTY REPORTED TYPES OF EVENTS EVENTS Ice Storm, Heavy Snow, Winter weather/mix, Coke 13 and Winter Storm Ice Storm, Heavy Snow, Winter weather/mix, Concho 9 and Winter Storm Crockett 15 Ice, Ice Storm, Heavy Snow, and Winter Storm Ice Storm, Heavy Snow, Winter weather/mix, Irion 10 and Winter Storm Kimble 12 Ice Storm, Heavy Snow, and Winter Storm Ice Storm, Heavy Snow, Winter weather, and McCulloch 10 Winter Storm Ice Storm, Heavy Snow, Winter weather, and Menard 13 Winter Storm Ice Storm, Heavy Snow, Winter weather, and Reagan 8 Winter Storm Ice, Ice Storm, Heavy Snow, Winter Storm, and Schleicher 13 Winter weather Ice Storm, Heavy Snow, Winter weather/mix, Sterling 12 and Winter Storm Sutton 14 Ice Storm, Heavy Snow, and Winter Storm Ice Storm, Heavy Snow, Winter weather/mix, Tom Green 10 and Winter Storm TOTAL 139 Significant Past Events 24 November 1996 This event affected eight of the twelve counties in the planning area. A vigorous upper level storm system interacted with a cold Canadian air mass to produce snow, sleet, and freezing rain on the Nov 24. Total sleet and snowfall amounts were generally between two and six CVCOG | Hazard Mitigation Plan Update | Page 4 Winter Storm inches over the Concho Valley, northern Edwards Plateau, and northwest Hill Country. The highest amounts were generally in the northwest Hill Country, where eight inches of snow fell at Junction. Icy roads proved hazardous to drivers and numerous accidents occurred throughout the area. There were a few fatalities and several injuries. The cold moisture damaged the unharvested cotton in Tom Green County. 24 February 2003 – McCulloch County An arctic cold front barreled through West Central Texas on the Feb. 23, dropping temperatures into the teens and 20s across all of the area. Strong overrunning began during the morning of the Feb. 24; producing thunderstorms that dropped large amounts of sleet and even hail to one half inch in diameter. The Big Country saw one to three inches of sleet during the afternoon and early evening of the 24th, with the activity slipping to the southeast into the Heartland during the evening of the 24th. One-half to one inch of sleet was reported across the Heartland. With temperatures remaining below freezing until the morning of the 26th, the accumulated ice remained on area roadways, with numerous accidents reported. There were also some minor injuries reported in the Abilene area, due to people slipping and falling down on the ice. Probability of Future Events A total of 24 unique events have impacted the CVCOG Region from 1950 to 2010. Although the counties reported a total of 139 incidents over the 60-year period, indicating that storms can impact the 12-county planning region as frequently as two winter storm events per year. Hence it is likely that the region will experience a winter storm event; an event is probable within the region within the next three years. Vulnerability and Impact All buildings and facilities are considered to be equally exposed and vulnerable to this hazard and could potentially be impacted because winter storm events are widespread within the planning area. Although a winter storm is a slow onset hazard with generally six to twelve hours of warning time, utility disruptions from winter storms can severely impact people and critical infrastructure. Ice and cold temperatures can lead to frozen water pipes and broken power lines due to a buildup of ice or downed trees, all of which can disrupt services. If the disruption continues it can lead to energy shortages and higher prices. While all populations and infrastructure are uniformly exposed in the CVCOG Region, the elderly and those with weakened immune systems are at a greater risk to death from hypothermia in extreme events. Homes with a poor foundation may have cracks or water damage from broken pipes in extreme events and residences with insufficient insulation will see an increased cost for heating. Hospitals and emergency facilities without back-up or emergency
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